Can you send me a copy of some chemical analyses of Mt. St. Helens ash and glass?

rocky Paul

Hi Paul,

I'll send you one analysis of the May 18 1980 pumice fall, but if you want more you should look in: Lipman et al. (1981) Compositional variations in 1980 magmatic deposits. USGS Prof. Pap. 1250:631-640. That is where these data come from: 

oxide           wt%
SiO2            63.66
Al2O3           17.45
Fe2O3           1.50
FeO             2.75
MgO             1.93
CaO             5.03
Na2O            4.57
K2O             1.30
H2O+            0.35
H2O-            0.14
TiO2            0.64
P2O5            0.09
MnO             0.07
CO2             0.01
S               0.07
Cl              0.02
F               0.03

Sincerely,

Scott Rowland 

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